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Old 01-25-2013, 11:24 PM   #1 (permalink)
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Default Amp meter conversion

My Machs amp meter never worked and I just converted to single wire alternator. I think I am going to order a amp meter converted to a voltmeter. Complete unit is only $60. Anyone try this ?
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Old 01-26-2013, 03:43 AM   #2 (permalink)
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Where did you find the conversion? Thanks
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Old 01-26-2013, 07:56 AM   #3 (permalink)
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I'm probably going to do it if they ever get around to doing the 66 gauge.

The 66-73 AMP gauge actually works, but you have to clean the connections between the gauge and alternator to do it. Many times I have seen them go from "dead" to full travel just by doing that. Lotta work, though.
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Old 01-26-2013, 11:26 AM   #4 (permalink)
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Not to sidetrack the thread but how can you hook up a voltmeter to a one wire alternator?
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Old 01-26-2013, 01:32 PM   #5 (permalink)
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You don't.
You connect:
One wire to any ground point in the car.
One wire to any good source of +12volts in the car.
Preferablly really close to the + terminal of the battery.

The further away from the battery or on a circuit that pulls lots of current will create errors in the voltage reading due to voltage drops.
The most accurate way is a dedicated wire from the voltmeter to the +terminal on the battery.
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Old 01-27-2013, 12:59 AM   #6 (permalink)
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The supplier is Rocketman Innovations. Wiring consists of connecting the + to Switched ignition circuit and ground for the neg. The new gauge will read centered at 12.5 volts and will read to the far left when off. Warranty for life, gauge face is restored and new movement is brand new air core style.
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Old 01-27-2013, 09:09 AM   #7 (permalink)
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I looked all over for a '66 conversion and finally gave up and went with a complete custom gauge set from Speedhut.
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Old 01-29-2013, 03:51 PM   #8 (permalink)
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Got an email back from Bob at Rocketman. I'm on his list for when the '65/'66 unit becomes available. He doesn't have an eta yet but it's his next project evidently...
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Old 01-29-2013, 04:23 PM   #9 (permalink)
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He added me to his list in February 2012 with the same response.
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Old 02-16-2013, 01:26 AM   #10 (permalink)
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I found a place called Redline Gauge Works that will convert my Ammeter, but they want $180 to do it. Ouch.
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Old 05-03-2013, 07:53 AM   #11 (permalink)
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From Rocketmans Site

Volt Meters
April 23, 2013: After much work and frustration, I have decided to drop the 65-66 voltmeter project. The main component I was hoping to use is still not available with no release date in sight and I have not come up with another sellable P&P solution. The guys over on the Vintage Mustang Forum have used a SunPro aftermarket gauge in their dash; the thread about it is here: ammeter to voltmeter conversion
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Old 05-03-2013, 08:03 AM   #12 (permalink)
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I did the sunpro install. Cheap and looks really good I think.
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